In what sense is influenza a zoonotic disease? A. It has animal reservoirs, especially birds and swine. B. It is transmitted by "stealth" arthropods. C. It is transmitted frequently by contact with wool. D. The main reservoir is wild carnivores. E. None of the above.

A. It has animal reservoirs especially birds and swine

Explanation:

A zoonotic disease is something that normally exists in animals as in animal resevoirs like birds and swine, but can be transmitted to humans. When this happens our body does not have the proper antibodies prepared to combat the infection as it is foreign to us.  

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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the electromagnetic energy from the sun arrives in the form of visible and invisible light.